261646175564479 has 2 divisors, whose sum is σ = 261646175564480. Its totient is φ = 261646175564478.

The previous prime is 261646175564357. The next prime is 261646175564483. The reversal of 261646175564479 is 974465571646162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261646175564479 - 2³³ = 261637585629887 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261646175664479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130823087782239 + 130823087782240.

It is an arithmetic number, because the mean of its divisors is an integer number (130823087782240).

Almost surely, 2^{261646175564479} is an apocalyptic number.

261646175564479 is a deficient number, since it is larger than the sum of its proper divisors (1).

261646175564479 is an equidigital number, since it uses as much as digits as its factorization.

261646175564479 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1828915200, while the sum is 73.

The spelling of 261646175564479 in words is "two hundred sixty-one trillion, six hundred forty-six billion, one hundred seventy-five million, five hundred sixty-four thousand, four hundred seventy-nine".